{"record":{"id":"586104eb17545afb","repo":"Yeachan-Heo/oh-my-codex","slug":"failed-to-kill-tmux-pane-finalproof-paneid-r","errorCode":null,"errorMessage":"failed to kill tmux pane ${finalProof.paneId}: ${result.stderr}","messagePattern":"failed to kill tmux pane (.+?): (.+?)","errorType":"exception","errorClass":"Error","httpStatus":null,"severity":"error","filePath":"src/team/tmux-session.ts","lineNumber":609,"sourceCode":"\nfunction killExactPaneSync(paneId: string, expectedPid?: number, assertAuthorization?: () => void): void {\n  const proof = readExactPaneProofSync(paneId);\n  if (proof.status === 'unavailable') throw new ExactPaneProofUnavailableError(proof);\n  if (proof.status === 'gone') return;\n  if (expectedPid !== undefined && proof.pid !== expectedPid) {\n    throw new Error(`tmux pane identity changed: ${paneId}`);\n  }\n  assertAuthorization?.();\n  // Authorization can read tmux. Re-prove immediately after it so a recycled\n  // pane ID cannot be targeted by the subsequent kill.\n  const finalProof = readExactPaneProofSync(proof.paneId);\n  if (finalProof.status === 'unavailable') throw new ExactPaneProofUnavailableError(finalProof);\n  if (finalProof.status === 'gone') return;\n  if (finalProof.pid !== proof.pid || (expectedPid !== undefined && finalProof.pid !== expectedPid)) {\n    throw new Error(`tmux pane identity changed: ${paneId}`);\n  }\n  const result = runTmux(['kill-pane', '-t', finalProof.paneId]);\n  if (!result.ok) throw new Error(`failed to kill tmux pane ${finalProof.paneId}: ${result.stderr}`);\n  const afterKill = readExactPaneProofSync(finalProof.paneId);\n  if (afterKill.status === 'unavailable') throw new ExactPaneProofUnavailableError(afterKill);\n  if (afterKill.status !== 'gone') {\n    if (afterKill.pid !== finalProof.pid) throw new Error(`tmux pane identity changed: ${paneId}`);\n    throw new Error(`tmux pane remains live after kill: ${paneId}`);\n  }\n}\n\nfunction appendNoUnderlineStyleFlags(style: string): string {\n  const normalized = style\n    .split(/[,\\s]+/)\n    .map((token) => token.trim())\n    .filter((token) => token.length > 0);\n  const combined = [...normalized];\n  for (const flag of TMUX_NO_UNDERLINE_STYLE_FLAGS) {\n    if (!combined.includes(flag)) combined.push(flag);\n  }\n  return combined.join(',');","sourceCodeStart":591,"sourceCodeEnd":627,"githubUrl":"https://github.com/Yeachan-Heo/oh-my-codex/blob/3ad79a8a6fe6e95fdbb8c00e40716fffe4011ce2/src/team/tmux-session.ts#L591-L627","documentation":"The `tmux kill-pane -t <paneId>` command itself returned non-zero after all identity proofs passed. The pane could not be killed at the tmux level; stderr is embedded. This leaves the pane live and cleanup incomplete.","triggerScenarios":"killExactPaneSync when the tmux server errors on kill-pane: pane is the last pane of a session needing kill-session, server-side internal error, or the pane vanished with a race that reported failure.","commonSituations":"Killing the last pane of a window/session where tmux refuses or cascades oddly; very old tmux bugs; permission/socket issues.","solutions":["Read embedded stderr; 'no such pane' usually means it is already gone — verify with a proof and treat as done","If it is the session's last pane, kill the session/window instead","Retry once after re-proving identity"],"exampleFix":null,"handlingStrategy":"retry","validationCode":null,"typeGuard":null,"tryCatchPattern":"catch (e) { if (/failed to kill tmux pane/.test(e.message)) { const p = readExactPaneProofSync(paneId); if (p.status === 'gone') return; retryOnce(); return; } throw e; }","preventionTips":["For last-panes, kill the window/session instead","Check stderr: 'no such pane' means already gone"],"tags":["tmux","kill-pane","cleanup"],"backgroundTag":"tmux-command-failed","analyzedSha":"3ad79a8a6fe6e95fdbb8c00e40716fffe4011ce2","analyzedAt":"2026-08-27T22:18:39.783Z","schemaVersion":2},"datasetVersion":"2026-08-28T00:17:15.603Z"}